Preparation and Properties of Thermoplastic Polyurethane based Wood plastic Composites

• 1、College of Chemistry and Chemical Engineering, Hunan University, 410082
• 2、 College of Material Science and Engineering, Central South University of Forestry and Technology, 410004

Abstract：Thermoplastic polyurethane (TPU) has the advantages of high elasticity and good wear resistance, but the high price limits its use of TPU. In this paper, polyurethane-based wood-plastic composites were synthesized with natural wood fibers as fillers to reduce the cost and improve the performance of WPC. Reducing the cost of materials can also improve the performance of WPC. The effect of wood powder content on the properties of the composites and the dispersion of wood powder in the composites were mainly investigated. The composites were prepared by twin screw melt blending extrusion method The properties were tested by universal testing machine and shao A hardness meter, and characterized by SEM and FT-IR. The results showed that adding wood flour could increase the mechanical properties. With the increase of wood powder content, the tensile strength of the materials increased at first and then decreased, the elongation at break decreased, and the hardness of Shao A increased; SEM showed that the agglomeration appeared when the wood powder content was 20 wt%. The optimum wood powder content was 15 wt% WPC. And the tensile strength was best 7.16 MPa and the dispersion was good.

Keywords： chemical engineering polyurethane wood plastic composites wood powder twin screw extrusion